Return to BSD News archive
Xref: sserve comp.unix.bsd:3661 comp.sys.ibm.pc.hardware:29140 Path: sserve!manuel!munnari.oz.au!mips!mips!sdd.hp.com!wupost!uunet!decwrl!netcomsv!mport!admin!jack From: jack@admin.mport.COM (Jack Craig) Newsgroups: comp.unix.bsd,comp.sys.ibm.pc.hardware Subject: Re: Another Adaptec Question Message-ID: <866@admin.mport.COM> Date: 13 Aug 92 19:59:47 GMT References: <1992Aug12.193421.14456@cs.wisc.edu> Followup-To: comp.unix.bsd Organization: Microport Inc., Scotts Valley, CA 95066 US of A Lines: 32 hollings@cs.wisc.edu (Jeff Hollingsworth) writes: >There seems to be two versions of the Adaptec 1542A card, one that supports bus >mastering and one that does not. I have two questions about this: not quit, the 1542[a/b] both support(are forced to use) bus mastering. the 1522 is a pio device(no bus master). >1.) How much benefit is bus mastering for UNIX (assumming the OS supports it) A lot! you should talk to neal nelson on this subject, 312-755-1000. hes doing a paper on it. >2.) Does either BSDI or 386bsd support bus mastering? its up to the host adapter and its driver. >One other question, what exactly do the Adaptec cards do that make them >more expensive than the Future Domain cards? i dont beleive the FD card is a bus master. BM takes a cpu on the card to do the work, that is part of the cost. jack... ============================================================================= Jack Craig Microport SVR4 408-438-UNIX uunet!mport.com!jack ============================================================================= >------------------------------------------------------------------------------- >Jeff Hollingsworth Work: (608) 262-6617 >Internet: hollings@cs.wisc.edu FAX: (608) 262-9777 >Home: hollings@warthog.madison.wi.us Home: (608) 256-4839 >X.400: <pn=Jeff.Hollingsworth;ou=cs;o=uw-madison;prmd=xnren;c=US>